Tubular coupling



Feb. 17, 1942. M v 2,273,211

' I TUBULAR COUPLING Fi 1ed Feb. 25, 1939 gj-rwemm i Patented Feb. 11, 1942 2,273,211

UNITED STATES PATENT OFFICE v TUBULAR cournmo Engene r, muneemevenmi. 01m. mm

' Application Febr ary 25. m, m; am 7 (cuss-i192):

gim shusn to tub uiar couplings sna in combination with tubularcouplins members closure sleevesthereformore particularly adapted g for .in suction cleaners where separable airwhich may be telescoping tubular sleeves, of an improved resilient preferably rubber closure tight connections are desired between attachment sleeve located on one of the tubular members in hose, tubes, nozzles and the like.

Telescoping couplings are frequently used .in

within the outer tubular member which may alsobe provided with an internal taper to with the external member. 1

Such slip Joint couplings are diiiicult. to make taper on the inner tubular lil'rulht, are likely tobe loose by thestriking against a pieceof furniture of anozzle connected to a suction tube by such 9:20

slip joint, and which may cause a separation of fitting I larged grippingringportion whichis thickerthan the remaining body portion of the sleeve and 5/ airtight engagement therewith, the rubber sleeve ,1 extending from the one tubular member beyond a suction cleaners including two tubular members one of which telescopes within the other. The

the end thereoi in separable or removable airtight engagement with the other tubular member when the tubular members are in connected posi- The improved closure sleeve includes an enwhich has a gripping or engaging surface of diffcrent diameter that of the surface of the tubular member separabiy engaged thereby.

By way ofexample, an embodiment of the improved tubular-coupling or connector including the improved closure sleeve is illustrated in the accompanying drawing forming part hereof, in which the figure illustrates an improved coupling the telescopingparts orin any event a leakage or having an internal closure sleeve.- airthroughthejoint. similar numeralsrefer to similar. parts Where straight tubular members are used it is throughout very diiiicult to obtain a satisfactory air seal.

' The. objects of the present improvements in,- clude the provision of an improved air sealed tubular coupling in which straight or taperedv telescoping tubular members may be utilized if desired and which is adapted to have a greaterinclude the provision of an improved closure sleeve for tubular couplings which provides a substantially air-tight connection and resists separation of the tubular members of the coupling.

Further objects of the improvements include the provision of an air-tight closure sleeve for a tubular coupling preferably in the form of a onepiece resilient sleeve permitting economical manufacture and convenience in use.

The foregoing and other objects are attained by the tubular couplings, closure sleeves, parts, combinations, and sub-combinations, which comprise the present invention, and the nature of which is set forth in the following general statement and a preferred embodiment of which are set forth in the following description, and which are particularly and distinctly pointed out and set forth in the appended claims forming part hereof.

The nature of the improved tubular coupling and closure sleeve therefor of the present inven- I the improved coupling is Ienerally by, I'll and includes telescoping inner 2 and outer tubular members or connected suction tubes Ill and-'lilpwliich'are associated with the suction cleaner. not and which may be of any usual type such as a.v tank type suction cleaner.

The improved tubularcoupling t ll includes a tubular member! and a tubular member Ill which are separableand which are registerable, with each other for providing a passageway from the one into the other preferably by telescoping the tubular member Iii into the tubular niember v In the coupling 2|. the telescoping tubular members ill and Ill are straight tubes of uniform diameter and the length of the telescoping portions thereof is limited by stop means, as for example a pin Iii extending outwardly from the inner tube It! and abuttable against the end tion may bestated in general terms as including tire circumference of the other tubular member,

In the coupling 2 I 0, the improved closure sleeve 2 I6 is an internal closure sleeve whose body portion 2" telescopes into the tubular member H3 and extends beyond the end of the tubular member 213, where th whole of said extended portion provides an enlarged resilient gripping ring portion or mouth' 220 engaging over said end of tubular member 2 l3 and having a thickness substantially greater than the thicknessof the body portion 2. The external circumference of the gripping ring mouth 220 is greater than the internal circumference of the the remainder of the closure sleeve, whereby the gripping ring mouth 22!) effects la'gsubstantially air-tight resilient circumferential closure engagement about the entire inner circumferential surtubular member 214, and greater than the external circumference of face of the tubular member 2, not only providing an air sealed coupling, but also resisting accidental separation of the telescoped members rand 2 by bumps or 'jars,towhich the coupling 2"] may be subjected during ordinary portion andlia'ving 11 use ,of the suction cleaner; of which it may be a part.

'l'he irnproved closure sleeve MS as showng i s of said outer tubular preferably made entirely of resilient material, preferably in one piece. However, the improved closure sleeve 216 may be made in part of rigid or non-resilient material, but in any event the enlarged gripping ring portion or mouth 220 of the closure sleeve 2 I6 is proportioned so as to efiect a resilient closure engagement against the entire surface of the tubular member 2 l4 when the tubular members 2|! and 2 are telescoped together.

- I claim:

A sealed tubular coupling for suction tubes ineluding separable tubular members telescoped one within the other, and a closure sleeve having a body portion making a circumferential closure with the'in'ner-tubular member and having a resilient gripping ring tend mouth at the end of said inner tubular member making a gripping closurewith the entire inner circumference of the outer, tubular member saidrgripping ring end mouth being thicker the'icl ure normally greater than. t

mam M v EUGENE 

